Pulling-stand for drill-casings.



A. G. LUDLUM.

PULLING STAND FOR DRILL UASINGS. APPL IOATION FILED AUG. 31,-1910.

' 1,027,867. Patented May 28,1912.

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' ATTORNEY COLUMBIA PLANOGRAPH CO.,WASHINGTON, D. c.

UNITED STATES PATENT OFFICE...

ALBERT C. LUDLIJ'M, OF NEW YORK, N. Y., ASSIG-NOR TO NEW YORK ENGINEERING COMPANY, A CORPORATION OF NEW YORK.

PULLINGr-STAND FOR DRILL-GASINGS.

Specification of Letters Patent.

Application filed August 31, 1910.

To all whom it may concern:

Be it known that I, ALBERT C. LUDLUM, a citizen of the United States, and a resident of the borough of Manhattan, city, county, and State of New York, have invented an Improved Pulling-Stand for Drill-Casings, of which the following is a specification.

This invention relates to an improved pulling stand designed and adapted for use in the operation of pulling out the casing of a drill from a hole in the earth. These casings are often driven to a considerable depth in the earth and the application of much power is required to withdraw the casing.

It is the purpose of the present invention to provide a stand of great strength and durability and adapted to provide an adjustable fulcrum for the support of the lever for pulling out the casing.

The invention consists of the features hereinafter pointed out and specified in the claim.

In the accompanying drawings in which the preferred embodiment of the invention is shown,Fi-gure 1 is a perspective view of the pulling stand. Fig. 2 is a side elevation thereof. Fig. 3 is an end elevation thereof. Fig. 4 is a side view of the fulcrum pin.

In embodying the invention a base is provided which has firmly secured thereto a fulcrum support having provisions at dif ferent heights for supporting a fulcrum pin for a pulling lever. The fulcrum pin is removable and is adapted for adjustment on the support so that the pulling lever may efiioiently operate on the casing as it rises from the hole in the earth.

The invention may be variously embodied.

In its preferred form, shown in the draw-.

ings, 1 is an oblong base made of channel iron having riveted thereto and across the upper side two parallel angle irons 2 and 3.

4 and 5 are a pair of uprights made of channel iron and have suitable provisions such as the opposite spaced apertures for the reception of the fulcrum pin 6. These uprights constitute the support for the fulcrum pin and rest upon the base and are firmly secured thereto by the bolts 7 and 8 which pass through the angle irons 2 and 3 and the lower ends of the uprights. These uprights are further secured in position by braces.

9 and 10 are the braces for the upright 14. Their upper ends are secured to the upright by the bolt 11 passing through the braces and the flanges of the upright. The lower ends of the braces are secured to the base by the bolt 12 which passes through the lower ends of the braces and through the flanges of the base.

13 and 14 are the braces for the upright 5. Their upper ends are secured to this upright by the bolt 15 and the lower ends are secured to the base by the bolt 16, in a similar manner to the braces 9 and 10. These braces extend laterally from the uprights to the base so as to subtend the outer angles formed by the base and the uprights, as clearly shown in the drawings, and thus to the utmost of their strength give the uprights resistance to lateral strains. The upright-s are disconnected from each other at their top and all the way along their length to near the bottom. This enables the lever to be lowered into and out of position between the uprights and without making it necessary to insert the lever endwise between the uprights. Under ordinary conditions, the lever will be any piece of timber that may be handy and which has the requisite strength or a tree of proper size may be used as the lever.

The fulcrum pin is provided at its outer ends with shoulders 17 and 18 which are adapted to engage the outer faces of the uprights when the pin is in position. It is also provided with two inner shoulders 19 and 20 adapted to engage the inner faces of the uprights. The pin is also preferably somewhat pointed at its ends, as shown, so that it may the more easily be inserted in the apertures. The apertures are preferably of uniform diameter and this diameter is slightly larger than that of the pin so that the latter may be readily inserted in position and withdrawn therefrom and positioned in the uprights at whatever point convenience requires. The pin 6 is preferably cylindrical and its shoulders are provided by the grooves 21 and 22 near the ends of the pin. The fulcrum pin is detached and separate from the lever and may be adjusted from one position to another without moving the lever from between the uprights. This detached arrangement of the fulcrum pin is important as it makes possible the convenience of improvising the lever at the place where the stand is to be used.

When in use the pulling stand is set close to the casing and the lifting lever has one end in engagement with the casing and is fulcrumed on the pin 6. As the caslng rises in response to the action of the lever the pin 6 is adjusted from a lower to a higher posit-ion. If the casing is made in sections, as is generally the case, the uppermost section of the casing will be detached when it has been withdrawn froln the hole. Then the fulcrum pin will be adjusted in a lower position for convenient attachment of the lever to the next section of the casing.

The shoulders 17 and 18 serve to prevent the uprights 4 and 5 from springing apart and the shoulders 19 and 20 serve to prevent the uprights from bending toward each other when the stand is in use.

It will be seen that by securing the up rights and the braces in position by means of bolts, the stand may beentirely taken apart for convenience in transportation.

What is claimed and what is desired to be secured by Letters Patent is A knockdown stand having a vertically adjustable fulcrum for pulling drill casings,

comprising a base plate having at the middle portion thereof separated parallel transverse bars, a pair of channeled uprights having a series of vertically arranged'holes for a fulcrum pin said uprights being secured to said bars at the lower end and open at the top to admit insertion of a separable and independent operating lever, inclined braces detachably connecting the ends of said base plate and the uprights, and a fulcrum pin having its ends of such diameter as to pass through said perforations in the uprights and having at each end a shouldered groove, said grooves being spaced to interlock with the walls of the holes, whereby when the fulcrum pin is in position it braces the uprights against distortion.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

A. G. LUDLUM.

Witnesses ANNA CAREY DILLs, CHAS. W. DRAKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

